Posts by david
Total # Posts: 2,359

Calculus
Show that the function F(x) = integral[x to 3x](1/t)dt is constant on the interval (0, +?). 
Geography
Wallace Creek has been offset by 130.0 meters (430 feet) to the right along the fault. The age of stream deposits indicates that this offset began 3700 years ago. Based on these figures, calculate the average rate of movement along this segment of the fault in centimeters per ... 
Chemistry
What is the mass of radon if its density is 9.73 g/l at stp 
Calculus
Find dy/dt at x = 1 and y = x2 + 3 if dx/dt = 4 I'm not sure how to set up this type of equation. Do you use the pythagorem theorem for this? Then take the derivative, and then plug in? 
Math
3. If the banks returned all the money plus interest accumulated from 1938 to 1998 it could be calculated using A=A0 (1.05)^t where A is the amount of money to be returned A0 was the initial amount and t is the number of years since 1938. (Notice that this formula assumes a ... 
Math
2. Growth function P=100 (645)^t/21 where P represents the cane toad population and t represents the time measured in months from when the toad was introduced in July 1935. A. What was the initial population of cane toads introduced into Australia? B. What was the population ... 
Math
1. You gathered data and realized that the temperature drop followed the function T=85 (0.3)^t/2 where T is the temperature in Celsius and t is the time in hours the water was left out for. A. What was the initial temperature of the water when it was placed outside? B. What ... 
Math
Sales of a video game released in the year 2000 took off at first, but then steadily slowed as time moved on. The table below shows the number of games sold, in thousands, from the years 2000–2010. Year 2000 2001 2002 2003 2004 2005 Number Sold (thousands) 142 149 154 155... 
Math
Due to advances in medicine and higher standards of living, life expectancy has been increasing in most developed countries since the beginning of the 20th century. The table below shows the average life expectancies, in years, of Americans from 1900–2010. Year 1900 1910 ... 
science
experiment to demonstrate that expired air contains carbondioxide 
international relations
what are the conflict resolutions of the chechens people? 
Discrete Mathematics
Alright. That makes sense. Thank you! 
Discrete Mathematics
Would I also multiply by the number of digits in order to cover numbers, as well? 
Discrete Mathematics
Most versions of Pascal allow variable names to consist of eight letters or digits with the requirement that the first character must be a letter. How many eightcharacter variable names are possible? I know that there are 2^7 ways to arrange letters and numbers in the ... 
Math
I need someone to show me or help with the steps of this problem: Bert received a commission of $247.50. If he works for 15% commission what price of the car did he sell? Thank you in advance to whoever helps me 
Math
40% of 20 gives us 8 boys (10% of 20 = 2, 2 * 4 = 8). 25% of 8 gives us 2 boys (8 / 4 = 2). 60% of 20 gives us 12 girls (firstly, 100%  40% = 60%. Secondly, 2 * 6 = 12). 50% of 12 gives us 6 girls (12 / 2 = 6). 2 boys who wear glasses + 6 girls who wear glasses = 8 students ... 
Discrete Mathematics
I probably should have elaborated. This is a proof based on the Transposition of Matrices, and it requires the use of the theorem "(A + B)^T = A^T + B^T". It is not a series of integers being raised to a power. Also, yes. I accidentally misspelled Mathematics. 
Discrete Mathematics
Prove (A1 + A2 +...+ An)^T = A1^T + A2^T +...+ An^T using Mathimatical Induction. 
Math
Oh, what a silly one. A party is like pouring oil into a car because that's where the funnel (a pun, "fun will") be. 
Math
The associative property states that you can add or multiply regardless of how the numbers are grouped. (3.5 + 2) + 4.5 = 3.5 + (2 + 4.5) 5.5 + 4.5 = 3.5 + 6.5 10 = 10 The commutative property states that you can add or multiply regardless of how the numbers arranged. 3.5 + 2... 
Trig
Explain how to find the reference angle of 1406 degrees. Find the reference angle. The reference angle is 34 but how do you get that? 
Math
How many radians are in a full rotation around a circle or 360 degrees. Help plz! 
intro to court suystems
Community prosecution stresses the need for the prosecutor to reach out to the community, but what does “community” mean? Is this reform based on a naïve assumption that all members of the same geographic entity share similar views? How might different ... 
history
After the middle of the 18th century, what options did Indians still have in responding to the encroachment of settlers? How had Indian behavior changed since the Iroquois mourning wars of the 17th century? 
Math
Two number cubes are rolled one blue and one yellow. Find the probability that the blue cube is less than 3 and the product is 8. a) Is this event independent or dependent? Explain why. b) Find the probability that the blue cube is less than 3 and the product is 8. 
Math
A baker is decorating the top of around cake with cherries. The diameter of the cake is 9.5 inches. Each cherry is 0.75 inches in diameter. About how many cherries will the baker need to decorate the perimeter of the top of the cake? 
Math
on tuesday evening randy spent 18 more minutes working on his math homework than he spent working on his philosophy readings. If he spent a total of 126 minutes on those two subjects then how much time did he spend on his math homework? 
Math
A circular dog bed has a circumference of about 72 inches. What is the diameter in inches of the dog bed to the nearest inch? 
Math
Wallace has a $500 budget for a pizza party. Pizza pies cost $12 each. He will also purchase drinks for $30, paper plates for $15 and napkins for $6. Write and solve an inequality that shows how many pizza pies Wallace can purchase. 
Calc III
find a vector that makes the same angle with respect to the yaxis that vector i + 3k makes with respect to the xaxis 
Physics
A man holds a child on his shoulder while watching a football match.how much work is done if the game lasts for 2hours 
mathematics
Thanks a lot. 
mathematics
a town has a population of 8400 in 1990. Fifteen years later, it's population had grown to 12 500. Assuming that the population continues to grow at the same exponential rate, when will the population reach 20 000? Please help im trying to answer this question for past 2 ... 
science;chem
The hydrolysis of ethyl acetate (CH3COOC2H5) by sodium hydroxide yields ethanol (C2H5OH) and sodium acetate (NaO2CCH3) by the reaction shown, which follows second order kinetics. In an experiment 500 mL of 0.1 M ethylacetate in water is mixed with 500 mL of 0.1 M NaOH in water... 
physics
What is the final answer going to be and where did you get that t is 2.05 seconds 
physics
On planet Seeturn, the free fall acceleration is 9.800 N/kg but there is also a strong downward electric field that is uniform close to the planet's surface. A 2.00 kg ball having a charge of 5.00 micro C (5.00*106) is thrown upward at a speed of 20.1 m/s, and it hits the... 
MATH!!!
Sorry it was supposed to be Determine a+b+c 25/84=1/a+1/ab+1/abc 
MATH!!!
I tried to multiply the equation by a then b then c... I don't know please help by showing the steps I am very lost Determine a+b+c 25/84=1/a+1/an+1/abc 
math gr 10
no those were the choices my maths teacher gave us 
math gr 10
Jordan invests $100 and doubles her money in 8 years. Which operation illiterates the correct use of the rule 72 to estimate the annual interest rate 72x8 8+72x8 72/100 100/8 I put 8+72x8 is that right?? 
gr 10 math
in a survey 144 people, 83 people said they liked eggs, 65 people said they liked toast, 30 said they liked neither. how many people like both? a 34 b 71 c 18 d 114 
math
I got 2582.05 idk what that is in years 
math
what is 5900 is years? thank 
physics
A circle has 360 degrees how can it be 720 degrees. 
Maths
A student spent 2 /9 of his pocket money on beverage and 1 /4 on books. What? fraction 
Chemistry
If one 5 mL dose of Milk of Magnesia contains 400 mg of magnesium hydroxide, calculate the concentration of magnesium hydroxide in mol/L. 
Math
h=10x v of object = v of cylinder v of hemisphere then u are good to go 
math
Write the equation of the line that has the following: Contains point (5,3) and is parallel to y = 6x – 5   The slope is 6 and the y intercept is 27 right? 
math
Write the equation of the line that has the following Contains point (3,6) and is perpendicular to y = 2x + 4  I got that the slope was 1/2 but is the yintercept really 15/2? can you even have this as a y intercept? 
Physics
Bob has a helicopter and from the launch pad he flies the following path. First he travels from the launch pad a distance of 52 kilometers at heading 79 degrees South of West. Then he flies 26 kilometers heading 22 degrees north of East. After this he flies 47 kilometers ... 
dbs
Determine the rate of interest at which a sum of money will become 216/125 times the original amount in 1 and a half years, if the interest in compounded half 
History
What are the “Rentier States” and why do the oilproducing countries in the Middle East qualify as rentier states? 
Mathematics
The height in metres of the water in a harbour is given approximately by the formula d=6+3cos30t, where t is the time in hours from. Find a) The height if the water at 9:45pm b) The highest and the lowest water level and occur 
Math
I have 20 tens. I have 3 times as many ones that I have tens. What number am I? 
MATH
HOW MUCH PETROL IS NEEDED TO TRAVEL88 KM 
chemistry
what are the electrolytes in ORS? 
Angular motion
a car has wheel of radius 0.3m and is traveling at a speed of 36m\s. calculate the angular speed of the wheel 
SCHM012
diagram all possible pathways for deexciting from n=4 to n=1 
math
Team Alpha had one fourth as many people as team Beta. After 6 people quit team Beta and 12 people were transferred to team Alpha from team Beta, both teams became equal. How many people were there originally on team Alpha? 
math
Team one had twice as many workers as team two. The number of workers in team one is reduced by 5 and the number of workers in team two is reduced by 2. How many workers are there in each team now if there are 7 more workers in team one? 
math
Three departments of a company employ a total of 1274 people. The second department employs 70 more people than the first one, and the third department employs 84 more workers than the second one. How many people work in each department? 
math
Kate used 555 grams of wool to knit a sweater, a hat and a scarf. She used 5 times less grams for the hat than for the sweater. She used 5 grams more for the hat than for the scarf. How many grams of wool did she use to knit each item? 
math
The lengths of the sides of a rectangle are in a ratio of 4:7. If the length is 31.5 in., find the width, perimeter and area of this rectangle. 
Maths
The ages of a woman and her daughter add to 45, five years ago, the woman is six times her daughters age. How old was the woman when her daughter was born? 
calculus
Find the constant a such that the function is continuous on the entire real line g(x)=x^2a^2/xa if x doesn't equal a 6 if x=a 
Chemistry
What is the percent yield of a reaction that converts 5,0 kg of toluene to 6,02 kg of benzoic acid? 2C6H5CH3 + 3O2 > 2C6H5CO2H + 2H2O 
Maths
A tub is filled in 20mins but there is a leakage in it which can empty the full tub in 1hr in how many minutes can it be refilled 
Science
Can you send me to a link that explains how genetic variation and environmental pressures can lead to a change in the characteristics of a population. 
MATHS
There are 2000 students in a course. They wrote a mathematics test which was scored out of 40 and then converted to percentage. 1. Draw a flowchart that reads the name, sex and score of each student, and outputs the names of the female students that scored below 45% and how ... 
math
Two circles touch each other. One of the circles has a diameter of 26 cm and the other circle has a diameter of 12 cm. Write down (a) the least distance between the centres of the two circles, ....................................................... cm (b) the greatest distance... 
Social studies
Why do you think the Canadian government is opposed to Quebec's becoming a separate nation? I don't want someone to tell me can you provide me with a source so I can find the answer 
Social studies
Thanks you for your time. 
Social studies
My second answer is cod fishing. 
Social studies
@Reed Also I meant in canada 
Social studies
Which of the following is no longer allowed in the Atlantic Provinces? A)cod fishing B)fishing C)aquaculture**** D)fish processing Correct? 
Math
Four pencils cost $0.60. How many pencils can you buy for $0.45? 
Math
If my ladder is 6m long and its foot is 1.5m from a vertical wall how far can the ladder reach up the wall? 
History
need help on history question The Gulf of Tonkin incident opened the door to A) Kennedy's assassination B) the Rolling Thunder strategy C) Lyndon Johnson realizing that the military D) could not win the war E) all of these answers are correct 
thermochemistry
For part A i calculated Q to be 99.1608 kJ/mol. I don't understand where to go from there though to find part b. 
thermochemistry
. Mountain climbers often brew tea by melting snow, which they heats over a stove. Our stove burns butane (C4H10), which has a heat of combustion of 2878 kJ/mol. The temperature of the snow is initially at 20 °C, and we need 80 °C water to brew tea. a. How much heat ... 
math
the daily production of two factories A and B are 300 and 200 bottle respectively .2% of the product o f each factory are found to be defective .if 6 defective bottle are randomly selected from a daily production of A and B .find the probability that 4 of the defective bottles... 
chemistry
Tfinal= m1c1T1 + m2c2T2/(m1c1+m2c2) I found this equation to solve for Tfinal, but not sure how it was derived or if its the correct method to solve this problem 
chemistry
A 3.04 g piece of aluminum at 60.0 °C is placed into a “styrofoam cup” calorimeter filled with 150.0 mL of water at 25.0 °C. What is the final temperature of the contents of the calorimeter once thermal equilibrium has been established (everything has the ... 
English
I was in a camp when i came back from the camp someone said "good exposure though what shoul i say ?? 
English
It about publicity 
English
I was in a camp when i came back someone said these 
Algebra 1
Consider the function L = 4h where L equals the number of legs on h horses. What would be the domain and range of the function? 
Math
Talor is building a birdhouse for his backyard. He needs a piece fo wood that is 8 inches long and 6 inches wide. What is the area of the piece of wood tayler needs 
Math
Byron’s house has a roof with dimensions shown. (Roof: 1m Height, 7m Hypotenuses, 12m length) He knows that the average rainfall in his suburb is 30cm per year. Byron would like to install a cylindrical rainwater tank to hold the water that runs off the roof. The tank is ... 
Biology
What is one of the outputs or products of respiration? It has to be a four letter word with the second letter being e because it is the hint that my teacher gave us. I couldn't find anything on it. So far I have disocovered is carbon dioxide, water, and atp. 
Philosophy
This is what i have done a. New Guinea is not advanced. This is Vagueness We do not know what New Guinea is not advanced in b. I called him a liar. It is true, and I am sorry for it. (Statement is that of a politician responding to the demand that he apologizes for calling a ... 
Philosophy
1. For each of the following underlined statements identify any vagueness, semantic ambiguity or syntactic ambiguity in the statement. If the statement is vague, explain why. If the statement is ambiguous, provide at least two alternative interpretations of the statement that ... 
Social studies
1. Why is mining important to the economy of the United States? Can you link a website where I can find this information more quicker? 
floral
September 
Math
theoretically if you roll a number cube 36 times, how many times would you expect to roll the number one? could you also give me explanation? Thank you. and also answer as fast as possible. 
Chemistry
In the analysis of a sample of drinking water, a rate of 25.00 mL of the water requires 16.04 mL of AgNO3 to 0.05647 M in order to achieve an end to the Mohr method. What is the concentration of chloride ions in the sample? 
Algebra 1
You have decided to get a job to pay for a car to drive. You estimate it will cost you $300 per month to buy and maintain the car. You get a job that pays $9.10 per hour. Write an equation for your pay as a function of the hours worked (Use x for the hours and y for the pay). ... 
Algebra 1
You have decided to get a job to pay for a car to drive. You estimate it will cost you $300 per month to buy and maintain the car. You get a job that pays $9.10 per hour. Write an equation for your pay as a function of the hours worked (Use x for the hours and y for the pay). ... 
Algebra 1
You have decided to get a job to pay for a car to drive. You estimate it will cost you $300 per month to buy and maintain the car. You get a job that pays $9.10 per hour. Write an equation for your pay as a function of the hours worked (Use x for the hours and y for the pay). ... 
Science
1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer. I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper. 2. A bucket of paint spills on ...